Nice photo. It might be a little dark but thats negligable at worst. It helps bring out the vibrant colors of the sunset imo. I think its a great photo, except for this brown rock (clump of dirt, ...? not sure what it is) towards the lower middle that seems to throw off the balance a bit. Personally i find it distracting, and sadly it takes away from the effect of the photo as my eye can't help but focus on that. Otherwise good job.